I don't replace my chains as often as I should.
I don't like it when I am riding non-matching wheels. Hubs, rims, valve length and tires must be the same front and rear.
If you ride anything less than Red, Dura-Ace or Super Record, I will think less of you.
I say I am happy racing 35+, but I wish I still had the time and body to do 1-2-Pro. (Nobody else knows this)